I am curious as to what your trigger group looks like. I had trigger slap on my slr-105 from the beginning and had to get a replacement trigger group from Arsenal. You also have to be a bit persistent with arsenal to get the fix done. Also I have tried a tapco G2 group and it also gets rid of the trigger slap. The only issue with the tapco fcg is the hammer rides the bolt carrier with more friction. The hammer will hold the bolt carrier back if you cycle the action slowly.

It looks very much like the G2 group. The one thing that I had problems with was the spring stell wire that holds the trigger and hammer retaining spring. I bent it taking it out and had to order one from tapco. I did call arsenal and they put me on hold then said that they would have a supervisor call me back. I didn't hold my breath and you guessed it, no call.